Taming the dreaded 10s spark

As some of you large scale guys may know, you get one heck of a spark when you plug in an 8-12s setup. And Castle escs do not like slow charge up, so i thought why not put one of these http://www.robotmarketplace.com/prod...-SWHELLA2.html between the batteries and the esc so that you can plug your packs in and then flip the switch to let all of the voltage flow through the already connected wires to avoid the spark. Am i right on this? I mean the spark is from the caps charging up; correct?